I have read a lot of topics about android lolipop issue and fixes. Most of them didn’t work for me. So I saw that, in fact, some of the users go back to android 4 doing a factory reset… That’s not a solution that’s why I will share tips that I found.
– First disable NFC parameter
– Then the most important is the size of ram used by background processuses (especialy google services and applications).
So you can “disable” some useless apps (and bakcground process associated), go to the main app board -> drag the google app to delete -> show information -> then disable notification and disable the app.
I do this for google drive, google music, google hangout…and the improve is really noticeable !
Hope this tips will works for you.